getAttrFromPath
lib.getAttrFromPath
Docs pulled from | This Revision | 17 minutes ago
Like attrByPath
, but without a default value. If it doesn't find the
path it will throw an error.
Nix has an attribute selection operator which is sufficient for such queries, as long as the number of attributes is static. For example:
x.a.b == getAttrByPath ["a" "b"] x
# and
x.${f p}."example.com" == getAttrByPath [ (f p) "example.com" ] x
Inputs
attrPath
-
A list of strings representing the attribute path to get from
set
set
-
The nested attribute set to find the value in.
Type
getAttrFromPath :: [String] -> AttrSet -> Any
Examples
lib.attrsets.getAttrFromPath
usage example
x = { a = { b = 3; }; }
getAttrFromPath ["a" "b"] x
=> 3
getAttrFromPath ["z" "z"] x
=> error: cannot find attribute `z.z'